Malicious PDF — malware analysis report

Static analysis result for SHA-256 89128eeacc222a46…

MALICIOUS

PDF

74.3 KB Created: 2021-09-21 08:16:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e39de861a85e7f25d227d4868b34bce5 SHA-1: 1f4c13a83df5e4ec4b21223148453de904c6c946 SHA-256: 89128eeacc222a46a1b7534bca969f8a12eee72543ae0cf48631368cdaf46add
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://krisoc.ru/uplcv?utm_term=hard+reset+droid PDF link annotation
    • https://martan.es/cenavarra_userfiles/files/82928403948.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/3531400263.pdfIn PDF document text
    • http://thuocnam.xyz/images/files/7752787799.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/fumiloruguzetikafake.pdfIn PDF document text
    • http://jvcc.cn/ckfinder/userfiles/files/210910070309823547zdl13.pdfIn PDF document text
    • http://aokisuper.com/ckfinder/userfiles/files/fonama.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/ferofunalejugenimivev.pdfIn PDF document text
    • http://combatkuntao.com/ckeditor/ckfinder/userfiles/files/20517375747.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16131b6a9d2875---zufuvofudatalevoje.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/0b91cf4852cca340698a94016f2f912f/42297731638.pdfIn PDF document text
    • http://print-resource.co.uk/ckfinder/userfiles/files/26027460446.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/39cd6c3b6a1bb4337516d983fc1f3b1b/nadaneki.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/tajurexuvijurureterupobu.pdfIn PDF document text
    • http://www.pataniforum.com/admin/jquery/ckfinder/userfiles/files/lakekugirovuv.pdfIn PDF document text
    • http://pilot-market.ru/new/files/file/jupag.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/vuj6os36keoi8v0j8idl451cn3/zezumo.pdfIn PDF document text
    • http://tubesealer.com/uploaded/file/8132563656133b8eea295a.pdfIn PDF document text
    • https://www.cifphosteleriayturismo.es/ckfinder/userfiles/files/lexoxunu.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/televaloxa.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/39859704572.pdfIn PDF document text
    • http://jingyilin.org/uploads/file/saferipe.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161390e48a2a20---kawasosu.pdfIn PDF document text
    • http://www.culturehousesun.org/photos/file/14646915684.pdfIn PDF document text
    • http://musiclivemarsala.com/userfiles/files/68355124376.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/mupogusagono.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149073b3ccdc---nosikenetugofamogej.pdfIn PDF document text
    • http://steelfurniturecn.com/d/files/databiwepesovupovur.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c0e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d8fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FA 17384 bytes
SHA-256: 508c1f83caf0ee71b036fd65dfe31f632c6a6fcb8a2d79b30c936486e578f0bb
font_02_sfnt_off00010560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10560 10080 bytes
SHA-256: b21743e909259755231bd234ab637bfc3424c15e271fd7b3416c028c49b2e575

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